Dawson, Fallon, and Powder River Counties have been working with the Federal Emergency Management Agency (FEMA) and Montana Department of Natural Resources and Conservation (DNRC) to produce new and updated 1% annual chance (100-year) floodplain maps. The project includes updating all the existing mapped floodplains for the Yellowstone River and Tributaries through Dawson County, Sandstone Creek and tributaries through Fallon County, and the Powder River and Little Powder River through Powder River County.

Updated floodplain maps will depict the latest, most accurate flood risk data, and will eventually result in updated FEMA floodplain maps. Most of the existing FEMA floodplain maps are based on old data and needs to be periodically updated. For more information see: Floodplain FAQs Flood Study Process